After quite a bit of playing around I have what I think might be a viable approach:
MooX::Role::Reconstruct
Of particular interest is test 05 and 06 in the t/subclasses directory.
I would appreciate thoughts on how it is implemented, how to improve the documentation, and how to expand the tests. I want to see how it plays with MooX::StrictConstructor in particular, but am unsure just how to include tests for that.
In the meanwhile, I hope someone finds this of interest. I expect to release it to CPAN within the week unless I receive a reason not to from my fellow monks or one of the Moo demi-gods.
You must always remember that the primary goal is to drain the swamp even when you are hip-deep in alligators.